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Home/Diagnosis/ICD-10 Coding for Polymyositis

ICD-10 Coding for Polymyositis

M33.22
M33.21
M33.29

Complete ICD-10-CM coding and documentation guide for icd-10 coding for polymyositis includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Inflammatory Myopathy
PM
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Key Information: ICD-10 Coding for Polymyositis

Essential facts and insights about ICD-10 Coding for Polymyositis

Use ICD-10 code M33.22 for polymyositis with myopathy, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Polymyositis with myopathy

Billable Code
M33.22
Billable

Diagnostic Criteria

  • • Biopsy shows CD8+ T-cells and MHC class I overexpression.

Applicable To

  • • Polymyositis with muscle weakness

Important Notes

  • • Ensure biopsy details are documented to differentiate from other myopathies.

Polymyositis with respiratory involvement

Billable Code
M33.21
Billable

Diagnostic Criteria

  • • Use when respiratory symptoms are documented with PFTs and imaging.

Applicable To

  • • Polymyositis with interstitial lung disease

Important Notes

  • • Ensure respiratory involvement is clearly documented with PFTs and imaging.

Polymyositis with other organ involvement

Billable Code
M33.29
Billable

Diagnostic Criteria

  • • Use when other organ systems are involved, confirmed by specific tests.

Applicable To

  • • Polymyositis with cardiac or gastrointestinal involvement

Important Notes

  • • Document specific organ involvement with appropriate tests.
Ancillary Codes

Additional codes that may be used with this diagnosis

R94.6

Abnormal EMG

Use when EMG shows short polyphasic MUPs, fibrillations, and bizarre high-frequency discharges.

J84.9

Interstitial lung disease

Use when interstitial lung disease is present.

Frequently Asked Questions

What is the ICD-10 code for polymyositis?

The ICD-10 code for polymyositis is M33.2, with specific subcodes like M33.21 for respiratory involvement and M33.22 for myopathy.

How do you code polymyositis with lung involvement?

For polymyositis with lung involvement, use M33.21. Ensure documentation includes PFTs and HRCT findings to support the code.

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